The end of the ordovician的意思|示意

Curiously, even though the end-Ordovician led to a huge loss of life, in a way it actually had very little impact on the persistence of lineages.

奇怪的是，虽然这次大灭绝导致大量物种消失，但是在某种程度上，它其实对物种世系的维持影响甚微。

The earliest of the Big Five, the end-Ordovician or Ordovician-Silurian extinction events some 444 million years ago, are reckoned by many to be the second largest.

五次大灭绝中发生最早的一次是奥陶纪末期或者奥陶纪-志留纪大灭绝事件，发生在大约4亿4千4百万年前。 许多科学家估计这次规模是五次当中第二大的。

It was an important evolution and marked the end of transgression and regression cycle of the Cambrian and Ordovician in Tarim area.

这标志着塔里木地区寒武纪和奥陶纪海进海退旋回的终结。

At the end of Ordovician Period, a differential elevation occurred in the central Shanganning Basin due to the Caledonian Movement.

陕甘宁盆地中部气田的主要储气层段为奥陶系马五段的古岩溶层。